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Vol 4: Shape-controlled synthesis of palladium and copper superlattice nanowires for high-stability hydrogen sensors.This article is from Scientific Reports, volume 4.AbstractFor hydrogen sensors built with pure Pd nanowires, the instabilities causing baseline drifting and temperature-driven sensing behavior are limiting factors when working within a wide temperature range. To enhance the material stability, we have developed superlattice-structured palladium and copper nanowires PdCu NWs with random-gapped, screw-threaded, and spiral shapes achieved by wet-chemical approaches. The microstructure of the PdCu NWs reveals novel superlattices composed of lattice groups structured by four-atomic layers of alternating Pd and Cu. Sensors built with these modified NWs show significantly reduced baseline drifting and lower critical temperature 259.4 K and 261 K depending on the PdCu structure for the reverse sensing behavior than those with pure Pd NWs 287 K. Moreover, the response and recovery times of the PdCu NWs sensor were of ~9 and ~7 times faster than for Pd NWs sensors, respectively.